Rated 4.3 out of 5 by 3
Rated 5 out of 5 by Bob52 Good Low End Dimming
Replaced 42 lamps in difficult access area and very pleased so far.
March 2, 2012
Rated 5 out of 5 by kenzking Perfect dimming bulb
Dims very low with a standard older style dimmer. This is the only bulb I have ever found that dims properly. It starts quickly and the 4100K is a nice bright white color. Well worth the money to get these! Very happy with them!
February 2, 2013
Rated 3 out of 5 by SweatyBetty back to the drawing board
I take one point off the score because there is about 1 second of delay before the light comes on, even though the TCP video says the bulb has "InstaBright". The bulb starts at about 80% brightness and warms up to 100% brightness in about a minute.
I take off another point because no way does this thing dim as claimed "all the way down to 2% with zero low end flicker!" Below 10% brightness, this bulb rapidly cycles through 2 or 3 brightness levels, the highest level being 100%. Below 10%, it's a crazy strobe light, not zero flicker. At about 10% and lower, the setting is unstable and might turn off after a few seconds. Getting the light to come back on requires increasing the dimmer switch setting back to nearly full brightness.
If you only need dimming down to 10% and don't care about instant on, this bulb can work for you.
My dimmer switch is a standard non-illuminated 600 watt incandescent slide dimmer switch. I did TCP's recommended burn in at full power for two hours before posting this review.
The front of the box says 4100K but the back of the box says "Light Appearance 5000 K". The back of the box is wrong.
4100K "cool white" color temperature is pleasing in my kitchen which has a lot of brown and yellow surfaces. 3500K "bright white" would be pleasing for a kitchen that has more white surfaces. I bought one of each color and tried them both. They both have the same dimming behavior so it's not likely I just got a defective sample.
With an incandescent bulb in the same socket, the brightness is stable and goes down to well under 2%. I can see the faintest red in the filament. There is no hysteresis in the dimming control, meaning the brightness is the same at the same position on the slider whether the slider is being moved up or down, with no mmory of where the slider was before. The TCP TruDim has a lot of hysteresis.
March 31, 2012